- HD 1080
- Runtime: 82m.
- Status: Released
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- Languages: en
- Country: United States of America
- Director: Phil Karlson
- Stars: Jeffrey Hunter, Pat Crowley, Dennis Hopper, Joby Baker, Susan Harrison
- keywords: witness, film noir
- Production_studio: Metro-Goldwyn-Mayer, Avon Productions
- Slogan: Marked for Death-Because He Knew Too Much!
- The Key Witness is featured in the top rankings of 1960
- #41 in Top Drama Movies of 1960
- #14 in Top Crime Movies of 1960
- #11 in Top Thriller Movies of 1960
An average Los Angeles citizen witnesses a gang murder when he stops to use a telephone. When he presents himself to the LAPD as the only person willing to identify the culprits, he opens himself up to a campaign of intimidation from the gang involved.